JPH06155154A - Power tool with table - Google Patents

Abstract

PURPOSE: To enhance the operativeness of a saw by allowing free movement within a frame in such a direction as to cross an axis between two working dispositions. CONSTITUTION: The second wheel 50 is fixed on the respective side parts of a frame 14. An intermediate member 46 rotates around the centers of respective wheels 40, 50 to keep a belt 48 around the two wheels tense. A cover 52 covers both the wheels 40, 50. The intermediate member 46 rotates around the axis 51 of the wheel 50, and the wheel 40 is forced and rotates inside the belt 48. A table 16 is jointed to the wheel 40, therefore the table 16 rotates around an axis 41 serving as the axis of the wheel 40 of the intermediate member 46. The axis 41 moves in such a direction as to cross itself between the two positions of 41a and 41b.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to power tools, and more particularly to saws of the type mounted on the first side of a table moving between two configurations, in a first configuration the tool is on the first side of the table. Operated on a work piece supported on a first side, and in a second arrangement, the tool is below the first side of the table such that the working portion projects from a hole in the table and the second portion of the table
Work on a workpiece supported on the side.

[0002]

Such devices are particularly effective for circular saws and were first described in DE-A-1628992. Here, the saw is mounted on a table that is pivotally attached to the frame and the first snip-off
To move between two working modes, a mode and a second bench saw mode.

The advantage of such a device lies in its flexibility. Not only does this device move between two completely different working modes, but it is also mounted on the frame and arranged for transport. Ideally, it should be able to be transported from the standard inner corridor to the trunk of a regular salon car. In this way, such a device can be transported to where it is needed. More preferably, it is light enough to be carried by a person.

However, a new regulation was introduced in one trial that threatens this flexibility in a sense. According to it, the table of the table saw must project well in front of and behind the blade, much longer than the diameter of the blade. To accommodate this table length, the frame must be correspondingly large, bulky, inconvenient to transport, and beyond its capacity to meet the desired objectives above.

This type of flipover
Another problem with oversaws is that in the snip-off mode, the saw is mounted behind the table, creating large chambers below and in front of the blade during processing of the workpiece. However, the pivot axis of the table must be in the center of the frame and near the center of the table. This was feasible in the past (for small tables) but nevertheless unsatisfactory due to the center of gravity of the table, the saw always on one side of the pivot in two working configurations. there were. As a result, in the case of unlocking, a strong momentary pivoting occurs on the table, which suddenly causes the table to pivot spontaneously and surprise the operator. Ideally, the table should be stationary on a fixed support at all times and must be raised for pivoting. However, this has not been possible in the past.

The above problems are exacerbated by the new regulations mentioned above. When the table is pivoted about its center, the center of its center of gravity moves away from the pivot axis by lengthening the table. Or, its axis approaches the back of the table (which then becomes the center of the frame), in which case the table is no longer centered on the frame. Therefore, in at least one arrangement, the long side of the table is on the short side of the frame, resulting in an overhang. This is out of balance and lacks biotechnological appeal.

Another problem with existing equipment is that it is mechanically simple if the pivot axis is above the table. This is because the bearing is fixed to the table, which is easily accomplished by mounting the bracket on one side of the table. However, this results in one side being below the pivot when it is at the top, while the other side is above the pivot when it is at the top. This is not a problem for normal work, but it means that accessories such as side tables can be used only for one mode of sawing work. Because in other modes such accessories will be at the wrong level.

It should be further noted that some design criteria are inherent in this tooling system. First, the table should be as thin as possible so that the blades have the greatest protrusion in bench saw mode. In any practical device, this ensures that the pivot of the table extends to one or the other side of the table. This is not possible on the bench mode side. The reason is that the pivot interferes with the movement of a large work piece such as a sheet material on the table. For the same reason, it is not possible on the snip-off mode side of the table, at least in front of the fence, which is integral behind the blade. If the Axis is in front of the fence, it will contact the Axis except for the shortest workpiece. Of course, the blade is usually in front of the fence. Under the new regulations requiring a relatively long table, the minimum allowable length of the table is to have the blade in the center of the table. With this in mind, it is clear that the pivot is not centered on the table (assuming a minimum allowable table size is desired). as a result,
At least one of the frames if the length of the frame on either side of the pivot is not long enough to accommodate the longer leaf of the table on either side of the frame
It is inevitable that the long leaf of the table overhangs slightly on the edge. It is difficult to accept either mode,
Make the saw more difficult to operate.

[0009]

The object of the present invention is therefore to overcome the abovementioned disadvantages or at least to alleviate their effects.

[0010]

A power tool according to the present invention comprises a frame, a table mounted on the frame,
A work assembly mounted on one side of the table, and a pivot system for pivoting the table between two positions relative to the frame about the axis, the axis comprising It is possible to move within the frame in a direction transverse to the axis between two positions.

By moving the swivel shaft, it can be positioned in the two arrangements without protruding onto the table. The shaft preferably moves in a generally arcuate manner on the table between the two positions. This allows the use of smaller frames even when using long tables.

The axis preferably moves in response to pivoting of the table about the axis, which is preferably coincident with a 180 degree pivoting of the table relative to the frame. In this case, if the shaft is raised from any position in the arc, the table will be raised from any of its positions. As a result, it is possible to eliminate the risk that the table will be unlocked from the frame and will fall unintentionally.

The axis moves from a position above the level of the table to a position below the level of the table. This allows the tables to be positioned at the same level in any arrangement. These accessories that can be used in one mode can also be used in other modes without changing the level between the two modes. The invention further provides a specific device, in which the pivoting system comprises an intermediate member for pivoting the table and the frame.

The table has a first gear fixed about the shaft, and rotating means disposed within the frame for rotating the first gear as the first gear moves between the two positions. May be included. The rotating means includes the first gear and the pivot (5) of the intermediate member.
A second gear (5) fixed to the frame around 1)
0) around a belt (48), whereby pivoting of the intermediate member relative to the frame causes the first gear wheel in the belt to rotate and the table to rotate.

The dimensions of the first and second gears are such that the range of pivoting of the intermediate member with respect to the frame between two positions of the shaft is 180 degrees between the first gear and the table.
The size is preferably such that it can be rotated once.
The first gear is mounted on one side of the table, in which case the first and second gears and the intermediate member are at the same level in the frame on each side of the table in two arrangements of the table. It is arranged so that.

The power tool preferably includes catching means for locking the table in either arrangement. The frame preferably has catch members at both ends of the frame configured to catch and support the front edge of the table in either arrangement of the table. Needless to say, it is preferable to have two pivot systems, one on either side of the table and frame.

As another most basic form example, for example,
A pivot member on the table can slide between the two positions within a hole in the frame. As a step-up, it may be a gear on a table shaft that rolls along a track in the frame. The table shaft can be connected to the frame by an intermediate member as described above. Instead of the belt, the second gear actually has the first
It may be a gear attached to the intermediate member that meshes with the gear and meshes with the arcuate rack in the frame.

The present invention will be described below with reference to the accompanying drawings as embodiments.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a power tool 10 is a saw having legs 12 that support a frame 14. The table 16 pivots with respect to the frame via a pivoting system 18 described later. A saw assembly 20 is installed on the table 16 on its first side 16a.

The saw assembly 20 has a pivot 22 (see FIG. 3) between the pivot member 24 and the saw housing 26. Spring 2
8 biases the saw housing 26 to the open position of FIG. The saw housing 26 includes a motor 30 drivingly connected to a saw blade 32 (see FIG. 2) under a lower guard 34. The handle 36 pivots the housing 26 up and down about the pivot 22 to move the blade 32 to the side 16a of the table 16a.
Plunge into the work piece supported above. Fence 1
7 is used to position the workpiece. The table 16 has holes (not visible) through which the blades descend.

When the table 26 is pivoted to the lower right, the housing 26 is locked by means not shown. When locked in this position, as shown in FIG. 4A, the table 16 is in a position to pivot into the bench saw mode of FIG. Here, the second side 16b is the uppermost position, and the blade 32 projects rightward from the table 16. This mode moves relative to the blade, but is particularly useful for lip cutting long workpieces supported on the table 16.

A pivoting system 18 which allows movement between the two working modes shown in FIGS. 2 and 3 has a bracket 4 fixed to the table by means of bolts 44 (see FIG. 1).
It consists of a first gear 40 fixed to the side 16a of the table via 2. Two such gears 40 and bracket 4
2 are provided on both sides on the side 16a of the table. Only one is shown in the drawings.

The second gear 50 is formed on each side 13 of the frame 14.
It is fixed to. The intermediate member 46 serves to pivot about the center of each gear 40, 50 to tension the belt 48 around the two gears. Cover 52 has both gears 4
It covers 0,50. The member 46 pivots about the axis 51 of the gear 50 and the gear 40 is biased inside the belt 48 to rotate. Since the table 16 is fastened to the gear 40, the table is the same as the gear 40 of the member 46.
It revolves around a pivot 41, which is the axis of. Further, the axis moves in a direction transverse to itself between the two positions 41a and 41b of the drawing.

The dimensions and positions of the gears 40 and 50, and the length of the member 46 are determined by the angle x (side 1 of the table in FIG. 3 above).
Axis at a distance (t ') above the center line (t') between 6a and 16b and below (t ") the center line, ie, t '= t", the angle at which axis 41 of the axis of passage passes. Turning and gear 40 at the same time
Is selected to allow the table 16 to rotate up and down, allowing half a turn.

This continuous movement is shown in FIG. Figure 4
In (A), the side 16a of the table is in the uppermost position, the saw assembly 20 is in the snip-off mode, the saw housing 26 is locked from the table in its lower position, and the blade 32 projects from the table. To do. Here, the shaft 41 is in the first position 41a. In FIG. 4B, the front portion 16c of the table 16 is pulled forward and raised. Due to the pivoting system 18, the table cannot be raised without advancing and cannot be advanced without raising. In other words, the table is constrained to follow the illustrated single path or continuous motion. In FIG. 4C, the table is 90
It is in a vertical position rotated by a degree. The intermediate member 46 has already passed the peak at this position and no further lifting of the table and assembly is required.

In FIG. 4D, the saw assembly 20 has begun to penetrate the frame 14, and in FIG. 4E the table 16 with the table 16 fully upside down (ie, side 16b facing up). It is inside. Here axis 41
Has completely moved to the second position 41b. Further, the second side 16b of the table is at the same level relative to the frame 14 as the first side 16a is in the snip-off mode of FIG. 4A. In this way, the accessories connectable to the frame 14 can be adjusted to serve the two working modes of the saw without adjusting for height changes of the table.

Further, the shaft 41 has the above-mentioned two positions 41a and 4a.
1b to move the arc 41c and from any position the shaft 41 moves up first, thus the table is constantly raised against gravity from any position. This reliably prevents movement of the table in the uncontrolled state of unlocking (or releasing) the locking (or locking) described below.

Referring again to FIG. 3, the rear end 16d of the table 16 is unsupported. The rear knob with the hook 64 is rotatably mounted on the side of the frame 14 on the bolt 62, but has no effect in this position of the saw. However, the stopper block 66 a is fixed to the side portion 13 of the frame 14. The intermediate member 46 abuts the block 66a, and the connection of the member 46 to the back of the table 16 then supports the table at the edge 16d.

The knob 60 is connected to the front knob 70 by a cable 71.
Is linked to. Instead of the bolt 62, the knob 70 has a handle 72 by which it rotates. The knob 70 has the same structure as the knob 60, and is rotatably attached to the side portion of the frame 14. The knob 70 has a hook 74 which catches the catch projection 76 on the table 16 and catch surfaces 76a and 76b.
Have. Catch 76 in snip-off mode
a is dominated by the hook 74. Rotation of handle 72 releases hook 74 from the catch. Further, the front of the table is supported by a protrusion 76 which rests on the knob 70. Only one catch is needed to hold the table 16 down. This is for example the trailing edge 1
This is because 6d cannot rise unless the front edge 16c rises. In other words, since the front edge 16c is locked by the hook 74, the entire table is similarly locked. In either case, the table is heavy at the trailing edge under the load of the saw assembly 20 and therefore difficult to lift anyway.

Upon release of the hooks 74, the table (one on each side of the frame) pivots as described with respect to FIG. However, when the table is again in the inverted position on the knobs 60, 70, the hook 64 of the knob 60 engages the catch surface 76b of the catch 76. Furthermore, it stops on the knob 60 and thus supports the front edge (now behind) of the table. The trailing edge 16d (now front) is unsupported except when the second stopper block 66b is formed in the side portion 13 of the frame 14 and the member 46 abuts the side portion 13 in the bench mode position. Again, no trailing edge 16d of the table is required here since it will not rise in the bench mode position unless the leading edge 16c is raised at the same time, i.e. to a greater extent. Moreover, the weight of the saw housing pushes its ends downwards. Knob 60 is shown and cable 71
However, both knobs 60, 70 are preferably springs that are biased counterclockwise (as seen in FIG. 3). One of the advantages of this device is the table 16
Is a single freedom of movement, which is a complex property, but bound by. However, as a result of this constraint, there is no risk of device jamming, even if the most basic form of the invention is adopted, for example. In such a case, the operator must ensure that the table maintains a right angle to the frame, or that the worker pivots the table in a right angle motion with respect to transverse movement of the pivot axis. Need to check. However, the device of the present invention does not require such concern. This is because pulling the table forward initiates pivoting of the table and vice versa. Thus, although a more basic form of the invention is practicable, the device described above with reference to the drawings is preferred.

Finally, FIGS. 1 and 3 show the intermediate member 46 for one side of the gear wheels 40, 50, other devices are shown in FIGS. 5 and 6. Here, the gears 40, 50 each consist of two half-shell configurations 40a, b and 50a, b, between which the member 46 is arranged. This has the effect of reducing the breaking load on the member 46, since the member 46 is supported by the gear at least in the weakest areas near the pivots 41, 51 for each of the gears 40, 50.

FIG. 5 shows an adjusting mechanism 80 for tensioning the belt 48, which has a curved surface 84 for pressing the belt 48.
And a tensioner 82 having a bolt and a nut 86 connected to the member 46. The bolt passes through the tensioner eye 88 to allow its adjustment.

[Brief description of drawings]

FIG. 1 is a front view of a saw according to the present invention.

2 is a side view (perspective) of the saw of FIG. 1 in bench mode operation.
Is.

FIG. 3 is a side view including a partial cross section of the saw of FIGS. 1 and 2 in a snip-off position.

4A to 4E are continuous side views (perspective view) showing a state of moving from a snip-off to a bench saw mode.

FIG. 5 is a side view of the frame of the preferred embodiment of the present invention.

FIG. 6 is a front view including a partial cross section taken along line VI-VI of the embodiment of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Power tool (saw) 14 ... Frame 16 ... Table 18 ... Axis rotation system 20 ... Work assembly (saw assembly) 26 ... Saw housing 32 ... Blade 40 ... First gear 46 ... Intermediate member 50 ... Second gear 16a ... 1st side 16b ... 2nd side 16c ... Front edge 16d ... Rear edge 60, 70 ... Knob 72 ... Handle 74 ... Hook 76 ... Catch

Claims (18)

[Claims] 1. A frame (14), a table (16) installed on the frame, and one side (16) of the table.
a) a work assembly (20) installed on it, and a pivoting system (18), said pivoting system pivoting the table about two axes with respect to the frame about an axis (41). A power tool that enables the shaft to move within the frame in a direction transverse to the shaft between two positions (41a, 41b). 2. The shaft is generally arcuate on the table (4
Power tool according to claim 1, characterized in that it moves between the two positions in 1c). 3. A power tool according to claim 1 or 2, wherein said shaft moves in response to pivoting of said table about said shaft. 4. The power of claim 3, wherein the shaft moves between the positions at the same time as pivoting between two positions of the table about the shaft at 180 degrees with respect to the frame. tool. 5. The axis extends from a position (41a) above the level of the table to a position (41a) below the level of the table.
Power tool according to any one of claims 1 to 4, characterized in that it can be moved to b). 6. Power according to any one of claims 1 to 5, characterized in that said pivoting system comprises an intermediate member (46) pivoting with respect to said table and said frame about said axis. tool. 7. A table (16) disposed within the frame for rotating a first gear (40) fixed about the shaft and for rotating the first gear when moving between the two positions. 7. Power tool according to claim 6, characterized in that it comprises rotating means (48, 50) which are adapted. 8. The rotating means comprises a belt (48) around the first gear and a second gear (50) fixed to the frame around a pivot (51) of the intermediate member. The power tool 2 according to claim 7. 9. The dimensions of the first and second gears are such that the range of pivoting of the intermediate member with respect to the frame between the two positions of the shaft is 18 for the first gear and the table.
Characterized in that it is determined to rotate 0 degree,
The power tool according to claim 8. 10. The first gear is mounted on one side of the table, and the first and second gears and the intermediate member are arranged on each side (16a, b) of the table in two arrangements of the table. 10. The power tool according to claim 9, wherein the power tools are arranged at the same level in the frame. 11. The power tool has catch means (60, 70, 70) for locking the table in any arrangement.
76) Power tool according to any one of claims 1 to 10, characterized in that it comprises 12. The catch member (6) configured to catch and support a front edge (16c) of the table in any arrangement of the table.
0,70) on both ends of the frame. 13. The power tool causes the movement of the shaft to the above-mentioned 2
Power tool according to any one of the preceding claims, characterized in that it further comprises limit means (66a, b) for limiting between positions. 14. A power tool according to claim 13 when dependent on claim 6, characterized in that the limit means has stoppers (66a, b) in the frame for abutting the member at the two positions. 15. A working head (32) of the working assembly.
15. A power tool according to any one of claims 1 to 14, characterized in that it can be positioned through a hole in the table and acts on a work peak supported on either side of the table. 16. The power tool of claim 15, wherein the work assembly is a circular saw pivoted to one side of the table. 17. The first gear according to claim 7 or any of claims 7 to 16 dependent on claim 7, characterized in that it comprises two half shells (40a, b) surrounding the intermediate member. Or 1 power tool. 18. Power according to any one of claims 9 to 17 as dependent on claim 8, characterized in that said second gear consists of two half shells (50a, b) surrounding said intermediate member. tool.